21491531709

素因数分解:

$3^1\times {\mathrm{43}}^1\times {\mathrm{157}}^1\times {\mathrm{257}}^1\times {\mathrm{4129}}^1$

素因数の和:4589

約数の個数: 32

約数和(自身を含む): 29630536320

約数和(自身を除く): 8139004611

約数列:

[1, 3, 43, 129, 157, 257, 471, 771, 4129, 6751, 11051, 12387, 20253, 33153, 40349, 121047, 177547, 532641, 648253, 1061153, 1735007, 1944759, 3183459, 5205021, 27874879, 45629579, 83624637, 136888737, 166601021, 499803063, 7163843903, 21491531709]

約数ペア:

[(1, 21491531709), (3, 7163843903), (43, 499803063), (129, 166601021), (157, 136888737), (257, 83624637), (471, 45629579), (771, 27874879), (4129, 5205021), (6751, 3183459), (11051, 1944759), (12387, 1735007), (20253, 1061153), (33153, 648253), (40349, 532641), (121047, 177547)]